Melodi- yes, the "1 quart" version uses 1 quart of tomato puree. But it's a 1/4 CUP of chopped green pepper, not 1/4 pepper. (although depending on what size peppers you have, I suppose it could end up being half a pepper!)
But if you're going to multiply it by 4, you might as well just use the original recipe in post #2.
And Carol- you're right, that purple basil vinegar makes a big difference in whatever you add it to! BTW, it makes a fantastic marinade for tougher meat (or even nice steaks)... if you marinate the meat in it overnight, it really tenderizes it. I usually just splash it on to steaks before tossing them on the grill.
And don't go spending a lot on fancy vinegar to make it, either. It makes the harshest, cheap "white distilled vinegar" smooth right out...
Summerthyme